An example operation may include one or more of receiving a request to authorize an in-flight transfer of a parcel between a source unmanned aerial vehicle (UAV) and a target UAV, authenticating, via a blockchain, an identity of the source UAV and an identity of the target UAV based on one or more predefined keys included in the request, and in response to the blockchain authentication being successful, initiating delivery of the parcel from the source UAV to the target UAV while one or more of the source UAV and the target UAV are in-flight.